tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.12.15a head: 22a5aeecf105617107dc7f8ee4f6cb1231630a15 commit: d9087ff33fe5e724396f7d93e0b4d089dce95601 [117/132] rcu/nocb: De-offloading CB kthread :::::: branch date: 3 hours ago :::::: commit date: 4 hours ago config: i386-randconfig-s032-20201215 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-184-g1b896707-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/com... git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags rcu dev.2020.12.15a git checkout d9087ff33fe5e724396f7d93e0b4d089dce95601 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_plugin.h:1492:5: sparse: sparse: symbol 'nocb_nobypass_lim_per_jiffy' was not declared. Should it be static? kernel/rcu/tree.c:1434:9: sparse: sparse: context imbalance in 'rcu_start_this_gp' - different lock contexts for basic block kernel/rcu/tree.c:1846:9: sparse: sparse: context imbalance in 'rcu_gp_init' - different lock contexts for basic block kernel/rcu/tree.c:2626:9: sparse: sparse: context imbalance in 'force_qs_rnp' - different lock contexts for basic block kernel/rcu/tree.c:2679:25: sparse: sparse: context imbalance in 'rcu_force_quiescent_state' - unexpected unlock kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_stall.h:319:9: sparse: sparse: context imbalance in 'rcu_print_task_stall' - unexpected unlock kernel/rcu/tree_stall.h:545:9: sparse: sparse: context imbalance in 'print_other_cpu_stall' - different lock contexts for basic block kernel/rcu/tree_stall.h:826:17: sparse: sparse: context imbalance in 'rcu_check_gp_start_stall' - different lock contexts for basic block kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_exp.h:189:9: sparse: sparse: context imbalance in '__rcu_report_exp_rnp' - different lock contexts for basic block kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_plugin.h:1538:16: sparse: sparse: context imbalance in 'rcu_nocb_bypass_trylock' - wrong count at exit kernel/rcu/tree_plugin.h:1555:13: sparse: sparse: context imbalance in 'rcu_nocb_lock' - wrong count at exit kernel/rcu/tree_plugin.h:1570:17: sparse: sparse: context imbalance in 'rcu_nocb_unlock' - unexpected unlock kernel/rcu/tree_plugin.h:1583:17: sparse: sparse: context imbalance in 'rcu_nocb_unlock_irqrestore' - unexpected unlock kernel/rcu/tree_plugin.h:1630:13: sparse: sparse: context imbalance in 'wake_nocb_gp' - wrong count at exit kernel/rcu/tree_plugin.h:1694:9: sparse: sparse: context imbalance in 'rcu_nocb_do_flush_bypass' - unexpected unlock kernel/rcu/tree_plugin.h:1709:13: sparse: sparse: context imbalance in 'rcu_nocb_flush_bypass' - wrong count at exit kernel/rcu/tree_plugin.h:1860:13: sparse: sparse: context imbalance in '__call_rcu_nocb_wake' - wrong count at exit kernel/rcu/tree_plugin.h:1924:9: sparse: sparse: context imbalance in 'do_nocb_bypass_wakeup_timer' - different lock contexts for basic block kernel/rcu/tree_plugin.h:1954:9: sparse: sparse: context imbalance in 'nocb_gp_wait' - different lock contexts for basic block kernel/rcu/tree_plugin.h:2146:9: sparse: sparse: context imbalance in 'nocb_cb_wait' - wrong count at exit kernel/rcu/tree_plugin.h:2182:13: sparse: sparse: context imbalance in 'do_nocb_deferred_wakeup_common' - different lock contexts for basic block vim +/__rcu_nocb_rdp_deoffload +2240 kernel/rcu/tree_plugin.h 8be6e1b15c54402 Paul E. McKenney 2017-04-29 2216 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2217 static int __rcu_nocb_rdp_deoffload(struct rcu_data *rdp) d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2218 { d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2219 struct rcu_segcblist *cblist = &rdp->cblist; d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2220 bool wake_cb = false; d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2221 unsigned long flags; d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2222 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2223 printk("De-offloading %d\n", rdp->cpu); d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2224 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2225 rcu_nocb_lock_irqsave(rdp, flags); d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2226 rcu_segcblist_offload(cblist, false); d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2227 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2228 if (rdp->nocb_cb_sleep) { d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2229 rdp->nocb_cb_sleep = false; d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2230 wake_cb = true; d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2231 } d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2232 rcu_nocb_unlock_irqrestore(rdp, flags); d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2233 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2234 if (wake_cb) d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2235 swake_up_one(&rdp->nocb_cb_wq); d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2236 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2237 swait_event_exclusive(rdp->nocb_state_wq, d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2238 !rcu_segcblist_test_flags(cblist, SEGCBLIST_KTHREAD_CB)); d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2239 d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 @2240 return 0; d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2241 } d9087ff33fe5e72 Frederic Weisbecker 2020-11-13 2242 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org _______________________________________________ kbuild mailing list -- kbuild(a)lists.01.org To unsubscribe send an email to kbuild-leave(a)lists.01.org